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Electromagnetic Induction

28 questions · Physics · NEET
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Electromagnetic Induction

28 questions · Physics · NEET

  1. AB is a part of an electrical circuit (see figure). The potential difference " VA​−VB​ ", at the instant when current i=2 A and is increasing at a rate of 1amp/ second is: Includes diagram2025 · Q144 · MCQ
  2. Let us consider two solenoids A and B, made from same magnetic material of relative permeability μr​ and equal area of cross-section. Length of A is twice that of B and the number of turns per unit length in A is half that of…2024 · Q178 · MCQ
  3. An emf is generated by an ac generator having 100 turn coil, of loop area 1 m2. The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of 0.05 T perpendicular to the axis of…2023 · Q167 · MCQ
  4. The net magnetic flux through any closed surface is :2023 · Q135 · MCQ
  5. The magnetic flux linked to a circular coil of radius R is ϕ=2t3+4t2+2t+5 Wb The magnitude of induced emf in the coil at t = 5 s is2022 · Q180 · MCQ
  6. A square loop of side 1 m and resistance 1 Ω is placed in a magnetic field of 0.5 T. If the plane of loop is perpendicular to the direction of magnetic field, the magnetic flux through the loop is2022 · Q148 · MCQ
  7. Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 >> R2, the mutual inductance M between them will be directly proportional to :2021 · Q169 · MCQ
  8. In which of the following devices, the eddy current effect is not used?2019 · Q135 · MCQ
  9. A 800 turn coil of effective area 0.05 m2 is kept. perpendicular to a magnetic filed 5 × 10–5 T. When the plane of the coil is rotated by 90o around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :2019 · Q151 · MCQ
  10. A long solenoid of diameter 0.1 m has 2 × 104 turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at…2017 · Q131 · MCQ
  11. A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turn of the solenoid is 4 ×10−3 Wb. The self-inductance of the solenoid is2016 · Q126 · MCQ
  12. A uniform magnetic field is restricted within a region of rafius r. The magnetic field changes with time at a rate dtdB​. Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside… Includes diagram2016 · Q127 · MCQ
  13. An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if any, induced in the coil ? Includes diagram2015 · Q119 · MCQ
  14. A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure. The potential difference developed across the ring when its speed is v, is Includes diagram2014 · Q127 · MCQ
  15. A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is2013 · Q131 · MCQ
  16. A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is2013 · Q129 · MCQ
  17. In a coil of resistance 10 Ω, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in weber is Includes diagram2012 · Q89 · MCQ
  18. A coil of resistance 400 Ω is placed in a magnetic field. If the magnetic flux ϕ (Wb) linked with the coil varies with time t (sec) as ϕ=50t2+4. The current in the coil at t = 2 sec is2012 · Q136 · MCQ
  19. The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be Includes diagram2011 · Q129 · MCQ
  20. A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mm s−1. The induced emf when the radius is 2 cm, is2010 · Q147 · MCQ
  21. A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity. V=vi. The magnetic field is directed along the negative…2009 · Q140 · MCQ
  22. A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cm is2009 · Q142 · MCQ
  23. A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4 × 10−3 Wb. The self-inductance of the solenoid is2008 · Q132 · MCQ
  24. A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction π1​(m2Wb​) in such a way that its axis makes an angle of 60o with B. The magnetic flux…2008 · Q134 · MCQ
  25. Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is2006 · Q138 · MCQ
  26. As a result of change in the magnetic flux linked to the closed loop as shown in the figure, an e.m.f. V volt is induced in the loop. The work done (joule) in taking a charge Q coulomb once along the loop is Includes diagram2005 · Q135 · MCQ
  27. The magnetic flux through a circuit of resistance R changes by an amount Δϕ in a time Δt. Then the total quantity of electric charge Q that passes any point in the circuit during the time Δt is represented by2004 · Q128 · MCQ
  28. For a coil having L = 2 mH, current flow through it is I=t2e−t then, the time at which emf become zero2001 · Q132 · MCQ